Water-insoluble monoazo dyestuffs

ABSTRACT

AZO DYESTUFFS USEFUL IN DYEING AND PRINTING HYDROPHBIC FIBROUS MATERIALS ARE PROVIDED WHICH CORRESPOND TO THE FORMULA   1-(R-N=N-),2-X,4-(R2-N(-R1)-),5-Y-CYCLOHEXANE   WHEREIN R IS A CYCLIC RADICAL; X IS ACYLAMINO; Y IS HYDROGEN, HALOGEN, ALKYL, OR AN ALKOXY RADICAL; R1 IS AN ALIPHATIC ETHER RADICAL TERMINATED BY AN ALKOXY CARBOXY RADICAL; AND R2 IS EITHER AN ALKYL RADICAL OR AN R1 RADICAL.

United States Patent 3,574,183 WATER-INSOLUBLE MONOAZO DYESTUFFS Winfried Kruckenberg, Leverkusen, Germany, assignor to Farbenfabriken Bayer Aktiengesellschaft, Leverkusen,

Germany No Drawing. Filed Feb. 3, 1967, Ser. No. 613,750 Claims priority, application Germany, Feb. 12, 1966, F 48,416 Int. Cl. C09b 29/08; D06p 1/02 US. Cl. 260-2071 3 Claims ABSTRACT OF THE DISCLOSURE Azo dyestulfs useful in dyeing and printing hydrophobic fibrous materials are provided which correspond to the formula wherein R is a cyclic radical; X is acylamino; Y is hydrogen, halogen, alkyl, or an alkoxy radical; R is an aliphatic ether radical terminated by an alkoxy carboxy radical; and R is either an alkyl radical or an R radical.

The present invention relates to water-insoluble azo dyestuffs of the formula These valuable new dyestufis are obtained by coupling a diazo component of the benzene or heterocyclic series with an amine of the general formula i R: X

alkyl radicals containing 1-2 carbon atoms, and R means an optionally substituted lower alkyl radical.

The coupling of the starting component is carried out in the usual manner, preferably in an acidic solution or suspension. As diazo components of the benzene series, those aniline derivatives which contain one or several cyano groups prove to be especially advantageous, inter alia. Examples of suitable diazo components include: 4 cyanoaniline, 4 nitroaniline, 4 nitro 2 chloroaniline, 4 nitro 2 cyanoaniline, 2,4 dicyanoaniline, 2,4 dinitroaniline, 3 chloro 4 cyanoaniline, 2 cyano- 5 chloroaniline, 3,4 dicyanoaniline, 2,5 dicyanoaniline, 2,6 dichloro 4 nitroaniline, 2 chloro 4 cyanoaniline, 4 amino acetophenone, 2 amino 5 nitrotoluene, 2 amino 5 nitroanisole, 3 nitro 4 aminotoluene, 2,4 dichloroaniline, 2,5 dichloro 4 nitroaniline, 2 trifluoromethyl 4 chloroaniline, 3 chloro- 4 amino 1 trifluoromethylbenzene, 2 cyano 4,5,6- trichloroaniline, 2,4 dinitro 6 bromoaniline, 2 cyano- 4,6 dinitroaniline, 2 cyano 6 bromoor -6-chloro- 4 nitroaniline, 2,4 dicyano 6 chloroaniline, 2- methoxy 4 nitroaniline, 2 amino 5 nitro benzoic acid methyl ester, 4 amino benzoic acid alkylamides, such as -methylor -dimethylamide, 4 amino benzoic acid methyl ester, 3 nitro 4 aminobenzoic acid butyl ester, 1 aminobenzene 3 or -4-methylsulfone or -ethylsulfone;

The following diazo components of the heterocyclic series are particularly useful: 2 amino 5 nitrothiazole, 2 amino 4 phenyl thiadiazole 1,3,5; 2 amino-S- aceto 3 nitrothiophene, 2 amino benzothiazole, amino triazole, 2 amino 5 nitro thiadiazole 1,3,4; 6 methoxy 2 aminobenzthiazole.

The amines specified in the following may be used as coupling components, for example:

2H4C O O OH;

02 40021140 COOHa 0 l C2H4O 021140 600113 C2HlCN NHCOCHa NBC 0 CH3 02 40621140 OOCHa NHCHO CzHn H C2 4 021140 C OCHa NHCONH:

021140 021140 L OCH; NHC OCHa I NHCOCHe CzHaCN CH3 H3 CzH C2H4O CHzCH-O IOOHa 0 Gitc.1140 canto i 10 0H3).

CzH4CN N 02 40021140 C 0 CH NHG OCH:

The other alkyl radicals, e.g. the radicals R and R may also be further substituted and be present, for example, in the form of haloalkyl radicals, such as chloroethyl; cyanoalkyl'radicals, such as cyanoethyl; or carbalkoxyalkyl radicals, such as carbomethoxy- (or -ethoxy-) ethyl radicals. Although, within the scope of the present invention, the definition of the radical R as a substituted alkyl radical also comprises the term an optionally substituted alkyl radical, this radical has been separately mentioned in the definition because of its specific construction.

The coupling components (II) can be obtained by reacting at 130 C., for example, aniline, which may contain the substituents X and Y, e.g. an N-fi-chloroethyl-N-alkylaniline, in ethylene glycol with ethyleneglycol-monosodium alcoholate, distilling the product and allowing the base to react in pyridine with chloroformic acid alkyl ester to give the corresponding carbonate.

The above-mentioned method for the production of the new azo-dyestuifs may also be modified in such a way that the formation of the carbonate groups takes place only in the final stage of the process, i.e. after coupling of the diazo component and, in this case, hydroxyethyl group-containing aniline coupling component, or that an acylamino group Z is converted into an acylamino group of a different type, in the final stage of the process, by selective hydrolysis and renewed acylation.

The dyestuffs which can be obtained by the present process are eminently suited for the dyeing and printing of hydrophobic material, especially of textiles or fibres of aromatic polyesters, for example of polyethylene terephthalates or of condensation products of terephthalic acid and 1,4-bis-(hydroxymethy1)-cyclohexane. Dyeings and prints of very good fastness properties, especially very good fastness to light, washing and thermofixation, are obtained on these materials. The dyesutfs are characterised by a good affinity.

The dyestufis are also suitable for the dyeing and printing of cellulose acetate and triacetyl cellulose and of synthetic polyamide and polyacrylonitrile fibre material.

The following examples are given for the purpose of illustrating the invention.

EXAMPLE 1 16.3 parts by weight 2-cyano-4-nitraniline are dissolved at 0-15 C. in 400 parts by weight concentrated sulphuric acid, diazotised with 17-0 parts by volume nitrosylsulphuric acid (42 g. nitrite in 100 ml. H with good stirring and cooling, and after about 3 hours poured on to about 3000 parts by weight ice. A small excess of nitrite is removed by amidosulphonic acid and the solution filtered. This solution is then combined with a solution of 29.7 parts by weight of the amino compound of the formula 021140021340 0 0 CH: NHCO CH3 partially neutralised with a dilute sodium hydroxide solution and the coupling completed with sodium acetate. The dyestuif is filtered and washed. In the dry state it is a black powder which dissolves in organic solvents, such as acetone or alcohol, with a blue colour. When finely dispersed by suitable additives, it dyes acetate rayon fabrics in clear violet shades of good fastness to washing and light.

dye fabrics of aromatic polyesters, such as polyethylene terephthalates, in the specified shades:

By the same method, the following dyestuffs can be obtained from the appropriate starting components. they N OCH;

I l NO: CH!

CaHAO 021140 O CH:

0 021140 O CH:

NBC 00H,

/C2H4O C O OH:

| l C2H4OC1H4OCOCH3 CN NHGO on, O I] om-Q-rtn-O-u (021140 021140 0 0 CH3);

ON 1 1110 0 CH8 I CQHQCN 01- N=N N\ H I CIHAO CzH4OCOCH3 N 1 Nnooorr,

I ll om-Qqq: Qmonauocuno co CH3):

N NHOO 011,

il if I] om-o C-N=N- N(C:H 0 02114000 0113 NHCO CH:

/O2Hu i C2H4OC2HaOCOCHa ON Nnooon,

NHCOGHa I Q'HO CCHa used in some dyestufi's of these examples as coupling component can be prepared in the following manner:

1 mol N-ethyl-m-acetylamino-aniline is admixed at 120 to 140 C., in the course of 6 to 8 hours, with 1.2 mol fl-chloro-fi'-methoxy-carbonyl-hydroxy-diethyl ether and 1.2 mol anhydrous sodium acetate in such a manner that the amount of sodium acetate is always somewhat smaller than required. The completion of the reaction is ascertained by chromatography. The base thus obtained may be separated from the other reaction products with water and a mixture of methanol and water, but it may also be converted into the dyestufl without further purification.

Shade Red.

Orange;

Violet.

Blue;

Violet;

Red violet:

Violet;

Blue;

Red;

Blue;

Other aromatic amines which contain the group can be obtained in the same manner. When the nitrogen is substituted by a cyanoethyl group, it is expedient to work with the corresponding bromine or iodine ether at about to C.

EXAMPLE 2 250 g. polyethylene terephthalate fibres are introduced at 50 C. into a dyebath of 8 litres which contains 4 g. of an emulsifying polyglycol ether and 4 g. of the finely dispersed dyestuff according to Example 1 as well as 16 g. of a carrier, for example benzoic acid, and 20 g. diammonium phosphate. The bath is heated to boiling in the course of 30 minutes and dyeing is continued at this temperature for 1 /2 to 2 hours. The dyeing is then washed at 70 C. for 20 minutes in an alkaline medium, rinsed and dried. A clear rust-blue dyeing, fast to light and 13 Washing, is obtained which is characterised by good fastness to thermofixation.

I claim: 1. Sulfonic acid and carboxylic acid free azo dyestuffs of the general formula in which R is a member selected from the group consisting of monocyano phenyl, dicyano phenyl, substituted phenyl and substituted mono or dicyano phenyl wherein the substituents are 1 to 3 substituents selected from the group consisting of chlorine, bromine, methyl, methoxy, nitro, and lower alkyl sulfone groups;

X is selected from the group consisting of NHCOH,

NHCOCH NHCONH NHCOC H NHCOCH OCH and NHSO CH Y is a member selected from the group consisting of hydrogen, methyl and lower alkoxy; R is a radical of the formula R R R and R are members selected from the group consisting of hydrogen and a C -C alkyl radical;

14 R is a member selected from the group consisting of lower alkyl and lower alkyl substituted by CN; and R is a member selected from the group consisting of lower alkyl with l to 4 carbon atoms, lower alkyl with 1 to 4 carbon atoms substituted by a member selected from the group consisting of chlorine, cyano, lower carboalkoxy with 1 to 4 carbon atoms in the alkoxy group, methoxy, and oxycarboalkoxy with 1 to 4 carbon atoms in the alkoxy group or R is a radical R 2. The dyestuif of claim 1 wherein Y is hydrogen or lower alkoxy, R R R and R7 are hydrogen and R is lower alkyl with 1-4 carbon atoms, cyanoethyl, or R 3. The dyestuif of claim 1 of the formula OzN- -N=N N\ 2 40021540 COCH; C N NHCO C H:

References Cited UNITED STATES PATENTS 3,268,507 8/1966 Kruckenberg 260207 FOREIGN PATENTS 933,160 8/1963 Great Britain.

CHARLES R. PARKER, Primary Examiner 30 D. M. PAPUGA, Assistant Examiner U.S. Cl. X.R.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,574,183 Dated April 6 1971 Inventor(s) WINFRIED KRUCKENBERG ET AL,

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column Line Error 3 l5 "C H OC H should be C H 0C 'H 4 10 "construction" should be -constitution-- 5-6 5th formula C1 should be ll 5-6 5th formula "C H CO H OCOCH should be Patent No. 3 r I 183 Inventor(s) Dated April 6,1971

WINFRIED KRUCKENBERG ET AL.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column Line 5-6 7th formula 7 2nd formula 7 11th formula CH CH should be 0 II --CHCH2OCH2CHOCOCH3 IIC N II should be Page 3 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,574,183 Dated April 6, 1971 WINFRIED KRUCKENBERG ET AL.

Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 5 E1222 7 12th formula Hqo-q:

C\S/c should be igned and sealed this 1 9th day of October 1971 (SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSGHALK Attestinnr Officer Acting Commissioner of Patent: 

